Nanomaterials & Organic Electronics Group TEI of Crete

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1 Nanomaterials & Organic Electronics Group TEI of Crete Dr. Emmanuel Kymakis Asc. Professor, Dept. of Electrical Engineering and Center of Advanced Materials & Photonics

2 Nanomaterials & Organic Electronics Group Center of Advanced Materials & Photonics Current Density (ma/cm 2 ) 0 PEDOT:PSS GO (4.9 ev) 2 GO-Cl (5.04 ev) GO-Cl (5.11 ev) GO-Cl (5.17eV) 4 GO-Cl (5.23eV) 6 Organic Photovoltaics Synthesis 14 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 V (Voltage) Characterization People Flexible electronics Fabricate Test Formulate Process

3 Facilities The research activities are implemented with a joint effort between the NANO group and the Ultrafast Laser Micro- and Nano- processing group of IESL of FORTH, to provide a research facility for state of the art research in organic electronics. TEIC TEIC

4 Facilities Research line for the fabrication and characterization of OPVs Double Glove box with integrated a) spin coater b) ozone cleaner c) thermal evaporator d) solar simulator Pending December 2014

Research activities of TEIC Photon Management Novel

nanostructures enable light manipulation at the

Photonic and plasmonic enhancement of photocurrent

and interfacial layers with SPG materials, compatible

Tandem device to enhance light harvesting; Optimize

5 Research activities of TEIC Photon Management Novel materials Device Engineering Plasmonics Metallic nanostructures enable light manipulation at the nanoscale. Photonic and plasmonic enhancement of photocurrent Solution processable graphene Replacement of electrode and interfacial layers with SPG materials, compatible with 2r2 Tandem, organic-inorganic hybrids etc. Tandem device to enhance light harvesting; Optimize electron/hole transport Enhancing OPV Performance and Stability through Integrated Material, Interfacial, and Device Engineering

Light Harvesting: Combining Photovoltaics with Plasmonics Increasing Cell Efficiency

4, 7452 (2013), Materials Today, 16 (4), 133.

Chemical Communications, 50 (40), 5285 Au, Ag, Al, Al-Au NPs have been used as

the local enhancement of the incident electromagnetic irradiation field in the

6 Light Harvesting: Combining Photovoltaics with Plasmonics Increasing Cell Efficiency and Stability (2011) Advanced Functional Materials, 21 (18), 3573 (2012), Nanoscale, 4, 7452 (2013), Materials Today, 16 (4), 133. (2013), RSC Advances, 3 (37), (2013), Advanced Materials, 25(34), 4760 (2014), Chemical Communications, 50 (40), 5285 Au, Ag, Al, Al-Au NPs have been used as additives in BHJ OPVs The PCE enhancement due to LSPR effects can be attributed a) to the local enhancement of the incident electromagnetic irradiation field in the vicinity of the small-sized NPs b) to multiple scattering by the larger diameter NPs c) Morphology!! Photo-oxidation at the cathode buried interface is minimized upon NPs doping Au NPs protect the Al electrode buried interface against degradation NPs stabilize the photoactive polymer conformational properties

Non-chlorinated Halogen-free solvents Functionalized graphene flakes for enhanced photogeneration & charge transport (2013), Advanced Functional Materials, 23, 2742-2749 (2013), Applied Physics

7 Graphene in OPVs Efficiency > 15% Lifetime > 20 years Scale Up <0.5/Wp Liquid Phase Exfoliation (graphene & graphene oxide) Polymer donors PTB7,PCDTBT,P3HT Acceptors PCBM, ICBA Flexible Roll to Roll Compatible Low Cost Facile processing >10% PCE Thermally stable Non-chlorinated Halogen-free solvents Functionalized graphene flakes for enhanced photogeneration & charge transport (2013), Advanced Functional Materials, 23, (2013), Applied Physics Letters, 102, (2013), Nanoscale, 5 (10), (2013), Physical Chemistry Chemical Physics, 15, (2014), IEEE J of Sel Top in Quant Electr, 20 (1), art. no (2014), ACS Applied Materials & Interfaces, 6(1), pp (2014) Small, 10, (2014), Journal of Materials Chemistry C, 2, (2014), Journal of Colloid And Interface Science,, 430, (2014), Applied Physics Letters (2014), 105, (2014), Nanoscale, 6, (2014), Chemistry of Materials, DOI: /cm502826f HTL: Hygroscopic PEDOT Metal oxides, graphene oxide TCE: Expensive ITO Carbon based materials Stable, Cheap, Work-function tuning Doped Graphene oxide R s <300Ω/sq <10$/m 2 LPE graphene 7

academic labs to industry, manufacturing

Examples Applications: electronic paper;

8 The Graphene Flagship will bring graphene, and related 2D materials, from academic labs to industry, manufacturing and society. Examples Applications: electronic paper; bendable smartphones; enhanced solar cells and batteries; lighter and more energy efficient airplanes On the longer term, graphene is expected to give rise to new computers and revolutionary medical applications such as artificial retinas.

9 Erasmus LLP Organic Electronics & Applications Design and Construction of the curriculum of a two year MSc joined degree in the modern field of organic semiconductors

Flexible Organic Photovoltaics Employ laser produced metal nanoparticles into the absorption layer 1. An Introduction

Flexible Organic Photovoltaics Employ laser produced metal nanoparticles into the absorption layer 1. An Introduction Among the renewable energy sources that are called to satisfy the continuously increased